feat: support enhanced filtering on interactions query

[jsstevenson]

close #490

Create an interactions query that lets the user constrain the universe of drugs/genes to search for interactions within. Also provides further drug filtering on the usual booleans.

• In trying to write tests for the latter, I hit an old issue that it seems impossible to make a drug from FactoryBot that has any of the antineoplastic/immunotherapy/approved flags set to true. I was thinking it had to do with the way those flags are initially set when the model instance is created, but this only confused me further. It's written up in Fix drug approval test case #257 , still not sure what the deal is.

[mcannon068nw]

I think this is good as is. I can't think of any examples now, but we should keep an eye out for creative/interesting ways to query interaction data going forward that we haven't thought of.